Liquid crystal display device

ABSTRACT

According to one embodiment, a liquid crystal display device includes a first substrate including a common electrode, an insulation film, and a pixel electrode, and a second substrate including a black matrix which includes a first light-shield portion, a second light-shield portion and a third light-shield portion, a first crossing portion at which the first light-shield portion and the second light-shield intersect, a second crossing portion at which the first light-shield portion and the third light-shield portion intersect, and a columnar spacer extending from a position overlapping the first crossing portion toward the first substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/231,081, filed Aug. 8, 2016, which is a continuation of and is basedupon and claims the benefit of priority under 35 U.S.C. § 120 for U.S.application Ser. No. 13/526,739, filed Jun. 19, 2012, which claims thebenefit of priority under 35 U.S.C. § 119 from Japanese PatentApplication No. 2011-141802, filed Jun. 27, 2011, the entire contents ofwhich are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a liquid crystaldisplay device.

BACKGROUND

By virtue of such advantageous features as light weight, small thicknessand low power consumption, liquid crystal display devices have been usedin various fields as display devices of OA equipment, such as personalcomputers, and TVs. In recent years, liquid crystal display devices havealso been used as display devices of portable terminal equipment such asmobile phones, car navigation apparatuses, game machines, etc.

In recent years, liquid crystal display panels of a fringe fieldswitching (FFS) mode and in-plane switching (IPS) mode have been put topractical use. The liquid crystal display panel of the FFS mode or IPSmode is configured such that a liquid crystal layer is held between anarray substrate, which includes a pixel electrode and a commonelectrode, and a counter-substrate. A spacer for creating a cell gap isdisposed between the array substrate and the counter-substrate. There isa demand for improving the occurrence of display non-uniformity due tothe spacer.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a view which schematically illustrates a structure and anequivalent circuit of a liquid crystal display panel which constitutes aliquid crystal display device according to an embodiment.

FIG. 2 is a cross-sectional view which schematically shows across-sectional structure of the liquid crystal display panel shown inFIG. 1.

FIG. 3 is a schematic plan view which illustrates a structure of a pixelin an array substrate shown in FIG. 2, as viewed from acounter-substrate side.

FIG. 4 is a schematic plan view which illustrates another structure ofthe pixel in the array substrate shown in FIG. 2, as viewed from thecounter-substrate side.

FIG. 5 is a schematic plan view for explaining a positional relationshipbetween a black matrix, a color filter and a columnar spacer in acounter-substrate, which is applicable to the liquid crystal displaypanel having the pixel structure shown in FIG. 3.

FIG. 6 is a view which schematically shows a cross section of thecounter-substrate, taken along line A-A in FIG. 5.

FIG. 7 is a schematic plan view for explaining a positional relationshipbetween a black matrix, a color filter and a columnar spacer in acounter-substrate, which is applicable to the liquid crystal displaypanel having the pixel structure shown in FIG. 3.

FIG. 8 is a plan view which schematically illustrates the structure of acounter-substrate, which is applicable to the liquid crystal displaypanel having the pixel structure shown in FIG. 3.

FIG. 9 is a schematic plan view for explaining a positional relationshipbetween a black matrix, a color filter and a columnar spacer in acounter-substrate, which is applicable to the liquid crystal displaypanel having the pixel structure shown in FIG. 4.

FIG. 10 is a plan view which schematically illustrates the structure ofa counter-substrate, which is applicable to the liquid crystal displaypanel having the pixel structure shown in FIG. 4.

FIG. 11 is a view illustrating an evaluation method and an evaluationresult of transmittance using a pseudo-pattern.

DETAILED DESCRIPTION

In general, according to one embodiment, a liquid crystal display deviceincludes a first substrate including a common electrode formed over aplurality of pixels, an insulation film covering the common electrode, apixel electrode which is formed in each of the pixels on the insulationfilm and is opposed to the common electrode and in which a slit isformed, and a first alignment film which covers the pixel electrode andis subjected to alignment treatment in a direction crossing the slit atan angle of 5° to 10°; a second substrate including a black matrix whichincludes a first light-shield portion extending in a first direction, asecond light-shield portion and a third light-shield portion whichextend in a second direction crossing the first direction, a firstcrossing portion at which the first light-shield portion and the secondlight-shield intersect, and a second crossing portion at which the firstlight-shield portion and the third light-shield portion intersect andwhich has a smaller area than the first crossing portion, the secondsubstrate further including a columnar spacer extending from a positionoverlapping the first crossing portion toward the first substrate, and asecond alignment film which covers a surface on a side facing the firstsubstrate and is subjected to alignment treatment in a direction whichis parallel to and opposite to the direction of the alignment treatmentof the first alignment film; and a liquid crystal layer held between thefirst substrate and the second substrate.

According to another embodiment, a liquid crystal display deviceincludes a first substrate including a common electrode formed over aplurality of pixels, an insulation film covering the common electrode,and a pixel electrode which is formed in each of the pixels on theinsulation film and is opposed to the common electrode and in which aslit is formed; a second substrate including a first light-shieldportion extending in a first direction with a first width, a secondlight-shield portion extending in a second direction crossing the firstdirection with a second width which is less than the first width, anintermediate light-shield portion which connects the first light-shieldportion and the second light-shield portion and extends in a graduallywidening fashion from a terminal end portion of the first light-shieldportion toward an edge of the second light-shield portion, a first colorfilter which is disposed on one side of the second light-shield portionand extends on the intermediate light-shield portion beyond the secondlight-shield portion, a second color filter disposed on the other sideof the second light-shield portion, an overcoat layer covering the firstcolor filter and the second color filter, and a columnar spacerextending toward the first substrate from a position overlapping thefirst color filter extending on the intermediate light-shield portion;and a liquid crystal layer held between the first substrate and thesecond substrate.

According to another embodiment, a liquid crystal display deviceincludes a first substrate including a gate line extending in a firstdirection, a source line extending in a second direction crossing thefirst direction, a switching element electrically connected to the gateline and the source line, an interlayer insulation film covering theswitching element, a common electrode formed over a plurality of pixelson the interlayer insulation film, an insulation film covering thecommon electrode, and a pixel electrode which is formed in each of thepixels on the insulation film, is electrically connected to theswitching element via a contact hole penetrating the interlayerinsulation film and the insulation film and is opposed to the commonelectrode, a slit being formed in the pixel electrode; a secondsubstrate including a black matrix including a first light-shieldportion which extends in the first direction and is opposed to the gateline and the switching element, and a second light-shield portion whichextends in the second direction and is opposed to the source line, theblack matrix having an oblique side, which extends in a directiondifferent from the first direction and the second direction, at a firstcrossing portion between the first light-shield portion and the secondlight-shield portion, the second substrate further including a columnarspacer extending toward the first substrate from a position overlappingthe first crossing portion; and a liquid crystal layer held between thefirst substrate and the second substrate.

Embodiments will now be described in detail with reference to theaccompanying drawings. In the drawings, structural elements having thesame or similar functions are denoted by like reference numerals, and anoverlapping description is omitted.

FIG. 1 is a view which schematically shows a structure and an equivalentcircuit of a liquid crystal display panel LPN which constitutes a liquidcrystal display device according to an embodiment.

Specifically, the liquid crystal display device includes anactive-matrix-type liquid crystal display panel LPN. The liquid crystaldisplay panel LPN is configured to include an array substrate (firstsubstrate) AR, a counter-substrate (second substrate) CT which isdisposed to be opposed to the array substrate AR, and a liquid crystallayer LQ which is held between the array substrate AR and thecounter-substrate CT. The liquid crystal display panel LPN includes anactive area ACT which displays an image. The active area ACT is composedof a plurality of pixels PX which are arrayed in a matrix of m×n (m andn are positive integers).

The array substrate AR includes, in the active area ACT, an n-number ofgate lines G (G1 to Gn) and an n-number of capacitance lines C (C1 toCn), which extend in a first direction X, an m-number of source lines S(S1 to Sm) which extend in a second direction Y crossing the firstdirection, an (m×n) number of switching elements SW, each of which iselectrically connected to the gate line G and source line S in eachpixel PX, an (m×n) number of pixel electrodes PE, each of which iselectrically connected to the switching element SW in each pixel PX, anda common electrode CE which is a part of the capacitance line C and isopposed to the pixel electrode PE. A storage capacitance CS is formedbetween the capacitance line C and pixel electrode PE.

The common electrode CE is commonly formed over a plurality of pixelsPX. The pixel electrode PE is formed in an island shape in each pixelPX.

Each of the gate lines G is led out to the outside of the active areaACT and is connected to a first driving circuit GD. Each of the sourcelines S is led out to the outside of the active area ACT and isconnected to a second driving circuit SD. Each of the capacitance linesC is led out to the outside of the active area ACT and is connected to athird driving circuit CD. The first driving circuit GD, second drivingcircuit SD and third driving circuit CD are formed on the arraysubstrate AR and are connected to a driving IC chip 2. In the exampleillustrated, the driving IC chip 2 is mounted on the array substrate AR,on the outside of the active area ACT of the liquid crystal displaypanel LPN, as a signal source which is necessary for driving the liquidcrystal display panel LPN.

In the embodiment, the driving IC chip 2 includes an image signal writecircuit 2A which executes control necessary for writing an image signalin the pixel electrode PE of each pixel PX in an image display mode fordisplaying an image in the active area ACT. In the meantime, the drivingIC chip 2 may also include, in addition to the image signal writecircuit 2A, a detection circuit 2B which detects a variation of anelectrostatic capacitance of a touch-sensing wiring (e.g. anelectrostatic capacitance between the capacitance line C and source lineS as the touch-sensing wiring) in a touch-sensing mode for detecting acontact of an object on a detection surface.

In addition, the liquid crystal display panel LPN of the illustratedexample is configured to be applicable to an FFS mode or an IPS mode,and includes the pixel electrode PE and common electrode CE on the arraysubstrate AR. In the liquid crystal display panel LPN with thisstructure, liquid crystal molecules, which constitute the liquid crystallayer LQ, are switched by mainly using a lateral electric field which isproduced between the pixel electrode PE and common electrode CE (e.g.that part of a fringe electric field, which is substantially parallel toa major surface of the substrate).

FIG. 2 is a view which schematically shows a cross-sectional structureof the liquid crystal display panel LPN shown in FIG. 1.

Specifically, the array substrate AR is formed by using a firstinsulative substrate 10 with light transmissivity, such as a glasssubstrate. The array substrate AR includes the switching element SW,common electrode CE and pixel electrode PE on an inner surface of thefirst insulative substrate 10 (i.e. that surface of the first insulativesubstrate 10, which is opposed to the counter-substrate CT).

The switching element SW illustrated in this example is a thin-filmtransistor (TFT). The switching element SW includes a polysiliconsemiconductor layer or an amorphous silicon semiconductor layer. Theswitching element SW is covered with a first insulation film 11.

The common electrode CE is formed on the first insulation film 11. Thecommon electrode CE is covered with a second insulation film 12. Thesecond insulation film 12 is also disposed on the first insulation film11. The pixel electrode PE is formed on the second insulation film 12.The pixel electrode PE is connected to the switching element SW via acontact hole which penetrates the first insulation film 11 and secondinsulation film 12. In addition, the pixel electrode PE includes slitsPSL which are opposed to the common electrode CE via the insulation film12. The common electrode CE and pixel electrodes PE are formed of atransparent, electrically conductive material such as indium tin oxide(ITO) or indium zinc oxide (IZO). The pixel electrode PE is covered witha first alignment film AL1. The first alignment film AL1 is disposed onthat surface of the array substrate AR, which is in contact with theliquid crystal layer LQ.

On the other hand, the counter-substrate CT is formed by using a secondinsulative substrate 30 with light transmissivity, such as a glasssubstrate. The counter-substrate CT includes a black matrix 31 whichpartitions pixels PX, a color filter 32, an overcoat layer 33 and acolumnar spacer (not shown) on that side of the second insulativesubstrate 30, which is opposed to the array substrate AR).

The black matrix 31 is formed on an inner surface 30A of the secondinsulative substrate 30 so as to be opposed to wiring portions, such asgate lines G, source lines G and switching elements SW, which areprovided on the array substrate AR.

The color filter 32 is formed on the inner surface 30A of the secondinsulative substrate 30, and also extends over the black matrix 31. Thecolor filter 32 is formed of resin materials which are colored inmutually different colors, e.g. three primary colors of red, blue andgreen. A red color filter, which is formed of a resin material coloredin red, is disposed in association with a red pixel. A blue colorfilter, which is formed of a resin material colored in blue, is disposedin association with a blue pixel. A green color filter, which is formedof a resin material colored in green, is disposed in association with agreen pixel.

In the present embodiment, color filters 32 of the same color extend inthe second direction Y shown in FIG. 1, and color filters 32 ofdifferent colors are alternately arranged in the first direction X (forexample, color filters 32 are arranged in the order of a red colorfilter, a green color filter, a blue color filter, a red color filter, .. . ). In short, the color filters 32 of mutually different colors arearranged in pixels neighboring in the first direction X. The colorfilters 32 of mutually different colors are abutted on each other so asnot to overlap each other on the black matrix 31. Boundaries between thecolor filters of different colors are located on the black matrix 31.

The overcoat layer 33 covers the color filters 32. The overcoat layer 33planarizes asperities on the surface of the black matrix 31 and colorfilter 32. That surface of the overcoat layer 33, which is opposed tothe array substrate AR, is covered with a second alignment film AL2. Thesecond alignment film AL2 is disposed on that surface of thecounter-substrate CT, which is in contact with the liquid crystal layerLQ.

The above-described array substrate AR and counter-substrate CT aredisposed such that their first alignment film AL1 and second alignmentfilm AL2 are opposed to each other. In this case, the columnar spacer,which is formed on the counter-substrate CT, creates a predeterminedcell gap between the array substrate AR and the counter-substrate CT.The array substrate AR and counter-substrate CT are attached by asealant in the state in which the predetermined cell gap is createdtherebetween. The liquid crystal layer LQ is composed of a liquidcrystal composition including liquid crystal molecules which are sealedin the cell gap created between the first alignment film AL1 of thearray substrate AR and the second alignment film AL2 of thecounter-substrate CT.

A backlight (not shown) is disposed on the back side of the liquidcrystal display panel LPN having the above-described structure. A firstoptical element OD1 including a first polarizer PL1 is disposed on anouter surface of the array substrate AR, that is, an outer surface 10Bof the first insulative substrate 10. In addition, a second opticalelement OD2 including a second polarizer PL2 is disposed on an outersurface of the counter-substrate CT, that is, an outer surface 30B ofthe second insulative substrate 30. A first absorption axis (or a firstpolarization axis) of the first polarizer PL1 and a second absorptionaxis (or a second polarization axis) of the second polarizer PL2 aredisposed, for example, in a positional relationship of crossed Nicols.

The first alignment film AL1 and second alignment film AL2 are subjectedto alignment treatment in mutually parallel directions in a plane whichis parallel to substrate major surfaces. Specifically, the alignmenttreatment direction of the first alignment film AL1 and the alignmenttreatment direction of the second alignment film AL2 are parallel toeach other and are opposite to each other. Accordingly, in the state inwhich no electric field is produced between the pixel electrode PE andcommon electrode CE, the liquid crystal molecules included in the liquidcrystal layer LQ are initially aligned in the alignment treatmentdirections of the first alignment film AL1 and second alignment film AL2in the plane (the direction in which liquid crystal molecules areinitially aligned is also referred to as “initial alignment direction”).In the state in which a fringe electric field is produced between thepixel electrode PE and common electrode CE, the liquid crystal moleculesare aligned in a direction different from the initial alignmentdirection in the X-Y plane.

FIG. 3 is a schematic plan view which illustrates the structure of thepixel PX in the array substrate AR shown in FIG. 2, as viewed from thecounter-substrate CT side. FIG. 3 shows only main parts which arenecessary for the description.

The gate lines G extend in a first direction X. The source lines Sextend in a second direction Y which crosses the first direction X. Theswitching element SW is disposed at an intersection portion between thegate line G and the source line S, but the depiction of the switchingelement SW is omitted.

The capacitance line C extends in the first direction X. Specifically,the capacitance line C is disposed in each pixel PX and extends abovethe source lines S, and is commonly formed over a plurality of pixels PXwhich neighbor in the first direction X. The capacitance line C includesthe common electrode CE which is formed in association with each pixelPX.

The pixel electrode PE of each pixel PX is disposed above the commonelectrode CE. Each pixel electrode PE is formed in each pixel PX in anisland shape corresponding to the pixel shape. In the exampleillustrated, the pixel electrode PE is formed in a substantiallyrectangular shape having short sides along the first direction X andlong sides along the second direction Y. A plurality of slits PSL, whichis opposed to the common electrode CE, is formed in each pixel electrodePE. In the example illustrated, each of the slits PSL extends in thesecond direction Y.

The first alignment film AL1 is subjected to alignment treatment in adirection crossing the slit PSL at an acute angle of 45° or less. Analignment treatment direction R1 of the first alignment film AL1 is, forexample, a direction crossing the second direction Y of extension of theslit PSL at an angle of 5° to 10°. In addition, the second alignmentfilm AL2 is subjected to alignment treatment in a direction which isparallel to the alignment treatment direction R1 of the first alignmentfilm AL1. The alignment treatment direction R1 of the first alignmentfilm AL1 and an alignment treatment direction R2 of the second alignmentfilm AL2 are opposite to each other.

FIG. 4 is a schematic plan view which illustrates another structure ofthe pixel PX in the array substrate AR shown in FIG. 2, as viewed fromthe counter-substrate CT side. FIG. 4 shows only main parts which arenecessary for the description.

Gate lines G extend in the first direction X. Source lines S shown inFIG. 4 extend substantially in the second direction Y, and includeintermediate portions which are bent in a V shape between neighboringgate lines G. A switching element is disposed at an intersection portionbetween the gate line G and source line S, but the depiction of theswitching element is omitted.

Like the example shown in FIG. 3, a capacitance line C extends in thefirst direction X, and is commonly formed over a plurality of pixels PXwhich neighbor in the first direction X. The capacitance line C includesthe common electrode CE which is formed in association with each pixelPX.

A pixel electrode PE of each pixel PX is disposed above the commonelectrode CE. Each pixel electrode PE is formed in each pixel PX in anisland shape corresponding to the pixel shape. In the exampleillustrated, like the intermediate portion of the source line S, thepixel electrode PE is formed in a V-shaped bent shape. A plurality ofslits PSL, which is opposed to the common electrode CE, is formed ineach pixel electrode PE. In the example illustrated, each slit PSL isbent in a V shape, like the intermediate portion of the source line S.

The first alignment film AL1 and second alignment film AL2 are subjectedto alignment treatment in directions crossing the slit PSL. Thealignment treatment direction R1 of the first alignment film AL1 and thealignment treatment direction R2 of the second alignment film AL2 aresubstantially parallel to the second direction Y and are opposite toeach other. The angle between the alignment treatment direction R1, R2and the slit PSL is about 5° to 10°.

The intermediate portion of the source line S, the pixel electrode PEand the slit PSL may have shapes which are formed by inverting theshapes in the illustrated example in the right-and-left direction.

FIG. 5 is a schematic plan view for explaining a positional relationshipbetween the black matrix 31, the color filter 32 and a columnar spacerSP in the counter-substrate CT, which is applicable to the liquidcrystal display panel LPN having the pixel structure shown in FIG. 3.

The black matrix 31 includes a first light-shield portion 311 extendingin the first direction X, and a second light-shield portion 312extending in the second direction Y. The first light-shield portion 311is mainly opposed to the gate line and switching element shown in FIG.3, which extend in the first direction X. The first light-shield portion311 has a first width W1 in the second direction Y. The secondlight-shield portion 312 is mainly opposed to the source line shown inFIG. 3, which extends in the second direction Y. The second light-shieldportion 312 has a second width W2 in the first direction X. The firstlight-shield portion 311 is greater in width than the secondlight-shield portion 312, and the first width W1 is greater than thesecond width W2.

In the example illustrated, the first light-shield portion 311 andsecond light-shield portion 312 form a crossing portion CR of asubstantially octagonal shape. Specifically, the first light-shieldportion 311 and second light-shield portion 312 extend, withsubstantially uniform respective widths, in directions perpendicular toeach other, but have gradually increasing widths in the vicinity of thecrossing portion CR.

Incidentally, the first light-shield portion 311 and second light-shieldportion 312 are formed integral or continuous in the same plane. Thus,the outer shape of the crossing portion CR is not visually viewed as theoctagonal shape as shown in FIG. 5. The outer shape of the crossingportion CR is defined by terminal end portions (i.e. sides extending inthe second direction Y with the first width W1) L1 and L2 at which thefirst light-shield portion 311 keeps the first width W1, terminal endportions (i.e. sides extending in the first direction X with the secondwidth W2) L3 and L4 at which the second light-shield portion 312 keepsthe second width W2, and oblique sides L5 to L8 which connect theseterminal end portions. The oblique sides L5 to L8 extend in directionsdifferent from the first direction X and second direction Y.Specifically, the crossing portion CR between the first light-shieldportion 311 and second light-shield portions 312 includes oblique sidesextending in directions different from the first direction X and seconddirection Y. In the meantime, the respective terminal end portions maybe connected with straight lines or curved lines. The curved lines inthe case are recessed toward the inside of the crossing portion CR.

The color filter 32 includes a first color filter 321 which is disposedon the left side in FIG. 5 and a second color filter 322 which isdisposed on the right side in FIG. 5. The first color filter 321 extendsover the first light-shield portion 311, and is disposed in the firstcolor pixels PX1 which neighbor in the second direction Y, with thefirst light-shield portion 311 interposed. The second color filter 322is a color filter of a color different from the color of the first colorfilter 321, extends over the first light-shield portion 311, and isdisposed in the second color pixels PX2 which neighbor in the seconddirection Y, with the first light-shield portion 311 interposed. An edge321E of the first color filter 321 and an edge 322E of the second colorfilter 322 are located on the second light-shield portion 312 and thecrossing portion CR. Specifically, the second light-shield portion 312is disposed between the first color pixel PX1 and second color pixelPX2. In the example illustrated, the first color filter 321 and secondcolor filter 322 are abutted upon each other, and there is no gapbetween the edge 321E and edge 322E.

In this case, if a pixel boundary B between the first color pixel PX1and second color pixel PX2 is linearly provided on the secondlight-shield portion 312, the edge 321E of the first color filter 321extends along the pixel boundary B on the second light-shield portion312, and extends to the second color pixel PX2 side from the pixelboundary B (i.e. toward the side L1 of the crossing portion CR) in thecrossing portion CR. Thus, the most part of the color filter, whichoverlaps the crossing portion CR, is the first color filter 321.

The columnar spacer SP is disposed at a position overlapping thecrossing portion CR. The underlayer of the columnar spacer SP is asingle color filter, and is the first color filter 321 in the exampleillustrated. Specifically, the columnar spacer SP overlaps none of theedges of the color filters.

In the example illustrated, the center O of the columnar spacer SP islocated on the pixel boundary B, but the center O may be offset towardthe first color pixel PX1 or the second color pixel PX2. In an exampleindicated by a broken line in FIG. 5, the center O of the columnarspacer SP is offset to the second color pixel PX2 side of the pixelboundary B. If a part of the columnar spacer SP is located on the pixelboundary B, an offset to the first color pixel PX1 side or to the secondcolor pixel PX2 side is allowable. Specifically, an offset amount fromthe pixel boundary B to the center O of the columnar spacer SP isallowable within such a range that a part of the columnar spacer SP islocated on the pixel boundary B. For example, the offset amount from thepixel boundary B to the center O of the columnar spacer SP is allowablewithin a range of 1 μm to 5 μm.

When columnar spacers SP are offset, columnar spacers SP which arelocated on the same straight line may be offset from the pixel boundaryB in a staggering fashion (i.e. one columnar spacer SP is offset on thefirst color pixel PX1 side, and another neighboring columnar spacer SPis offset on the second color pixel PX2 side). In this case, even ifmisalignment in attachment occurs between the array substrate AR and thecounter-substrate CT, any one of the columnar spacers SP exactly abutson the array substrate AR, and a variance in cell gap can be reduced.

In addition, in the example illustrated, the columnar spacer SP has acircular outer shape in the X-Y plane, but it may have a polygonal shapeor an elliptic shape.

The first color filter 321 and second color filter 322 are ones selectedfrom a red color filter, a green color filter and a blue color filter,and the first color pixel PX1 and second color pixel PX2 are onesselected from a red pixel, a green pixel and a blue pixel. For example,the first color filer 321 is a red color filter and the second colorfilter 322 is a blue color filter, and the first color pixel PX1 is ared pixel and the second color pixel PX2 is a blue pixel.

FIG. 6 is a view which schematically shows a cross section of thecounter-substrate CT, taken along line A-A in FIG. 5.

In the cross section along line A-A, the first light-shield portion 311and crossing portion CR of the black matrix 31 are formed on the innersurface 30A of the second insulative substrate 30. The first colorfilter 321 of the color filter 32 extends from a position overlappingthe first light-shield portion 311, which is located in the first colorpixel PX1 on the left side in FIG. 6, to a position overlapping thecrossing portion CR, and also extends from the pixel boundary B to thesecond color pixel PX2 side on the right side in FIG. 6. The secondcolor filter 322 extends from a position overlapping the firstlight-shield portion 311, which is located in the second color pixel PX2on the right side in FIG. 6, to a position overlapping the crossingportion CR, but terminates in front of the pixel boundary B, withoutextending beyond the pixel boundary B. The overcoat layer 33 covers thefirst color filter 321 and second color filter 322.

The columnar spacer SP extends from a position overlapping the crossingportion CR toward the array substrate AR. The columnar spacer SP isformed on the overcoat layer 33. A single color filter, namely the firstcolor filter 321 in this example, extends between the columnar spacer SPand the crossing portion CR of the black matrix 31. In addition, theovercoat layer 33 extends between the first color filter 321 and thecolumnar spacer SP. The columnar spacer SP and the overcoat layer 33 arecovered with the second alignment film AL2.

The content of the description with reference to FIG. 5 and FIG. 6 isone aspect of the embodiment. Next, another aspect of the embodiment isdescribed. The same structural parts as in the example described withreference to FIG. 5 are denoted by like reference numerals, and adetailed description is omitted.

FIG. 7 is a schematic plan view for explaining a positional relationshipbetween the black matrix 31, the color filter 32 and the columnar spacerSP in the counter-substrate CT, which is applicable to the liquidcrystal display panel LPN having the pixel structure shown in FIG. 3.

The black matrix 31 includes a first light-shield portion 311 extendingin the first direction X and having a first width W1, and a secondlight-shield portion 312 extending in the second direction Y and havinga second width W2. Like the above-described example, the first width W1is greater than the second width W2.

The first light-shield portion 311 linearly extends in the firstdirection X with the first width 1 which is substantially uniform, andthe first light-shield portion 311 is disposed on both sides of thesecond light-shield portion 312. In the example illustrated, the firstlight-shield portion 311, which is located on the left side in FIG. 7,is designated by “311L”, and the first light-shield portion 311, whichis located on the right side in FIG. 7, is designated by “311R”. Thefirst light-shield portion 311L includes a terminal end portion 311LEwhich is opposed to the second light-shield portion 312. The firstlight-shield portion 311R includes a terminal end portion 311RE which isopposed to the second light-shield portion 312.

The second light-shield portion 312 extends between the firstlight-shield portion 311L and the first light-shield portion 311R, andlinearly extends along the second direction Y with the second width W2which is substantially uniform. The second light-shield portion 312includes an edge 312LE which is opposed to the terminal end portion311LE of the first light-shield portion 311L, and an edge 312RE which isopposed to the terminal end portion 311RE of the first light-shieldportion 311R.

The black matrix 31 further includes an intermediate light-shieldportion 313 which connects the first light-shield portion 311 and secondlight-shield portion 312, and extends in a gradually widening fashionfrom the terminal end portion of the first light-shield portion 311toward the edge of the second light-shield portion 312. In the exampleillustrated, the intermediate light-shield portion 313 is disposed onboth sides of the second light-shield portion 312. In order todistinguish left and right intermediate light-shield portions 313, theintermediate light-shield portion 313 on the left side in FIG. 7 isdesignated by “313L”, and the intermediate light-shield portion 313 onthe right side in FIG. 7 is designated by “313R”.

The intermediate light-shield portion 313L connects the firstlight-shield portion 311L and second light-shield portion 312, andextends in a gradually widening fashion from the terminal end portion311LE of the first light-shield portion 311L toward the edge 312LE ofthe second light-shield portion 312. Specifically, the width of theintermediate light-shield portion 313L in the vicinity of the terminalend portion 311LE is equal to the first width W1, but the width in thesecond direction Y (up-and-down direction in FIG. 7) of the intermediatelight-shield portion 313L in the vicinity of the edge 312LE is increasedto become greater than the first width W1. In short, the intermediatelight-shield portion 313L has a trapezoidal shape having as an upperbase a side which is continuous with the terminal end portion 311LE, andhaving as a lower base a side which is continuous with the edge 312LE,with the upper base and lower base being parallel, and the upper basebeing shorter than the lower base.

The intermediate light-shield portion 313R connects the firstlight-shield portion 311R and second light-shield portion 312, andextends in a gradually widening fashion from the terminal end portion311RE of the first light-shield portion 311R toward the edge 312RE ofthe second light-shield portion 312. Specifically, the width of theintermediate light-shield portion 313R in the vicinity of the terminalend portion 311RE is equal to the first width W1, but the width in thesecond direction Y (up-and-down direction in FIG. 7) of the intermediatelight-shield portion 313R in the vicinity of the edge 312RE is increasedto become greater than the first width W1. In short, the intermediatelight-shield portion 313R has a trapezoidal shape having as an upperbase a side which is continuous with the terminal end portion 311RE, andhaving as a lower base a side which is continuous with the edge 312RE,with the upper base and lower base being parallel, and the upper basebeing shorter than the lower base.

Incidentally, the first light-shield portion 311, second light-shieldportion 312 and intermediate light-shield portion 313 are formedintegral or continuous in the same plane. Thus, the intermediatelight-shield portion 313 having the trapezoidal shape as shown in FIG. 7is not visually viewed.

In the example illustrated, the intermediate light-shield portion 313 isdisposed on both sides of the second light-shield portion 312. However,the intermediate light-shield portion 313 may be disposed on only oneside of the second light-shield portion 312. For example, while theintermediate light-shield portion 313R is disposed, the terminal endportion 311LE of the first light-shield portion 311L may be continuouswith the edge 312LE of the second light-shield portion 312.

The color filter 32 includes a first color filter 321 and a second colorfilter 322. The first color filter 321 is disposed on one of both sidesof the second light-shield portion 312, that is, in the first colorpixel PX1 on the left side in FIG. 7, and covers the first light-shieldportion 311L and intermediate light-shield portion 313L. In addition,the first color filter 321 extends over the intermediate light-shieldportion 313R, beyond the second light-shield portion 312. The secondcolor filter 322 is disposed on the other of both sides of the secondlight-shield portion 312, that is, in the second color pixel PX2 on theright side in FIG. 7, covers the first light-shield portion 311R, andcovers a part of the intermediate light-shield portion 313R. There is nogap between the first color filter 321 and the second color filter 322.

The columnar spacer SP is disposed at a position overlapping the firstcolor filter 321 which extends up to above the intermediate light-shieldportion 313R. The underlayer of the columnar spacer SP is a single colorfilter, and is the first color filter 321 in the example illustrated.Immediately below the columnar spacer SP, there are disposed theintermediate light-shield portion 313L, intermediate light-shieldportion 313R, and second light-shield portion 312 which is locatedtherebetween. Although not shown, like the above-described example, thefirst color filter 321 and second color filter 322 are covered with theovercoat layer. The columnar spacer SP is formed on the overcoat layer,and extends toward the array substrate.

For example, the first color filer 321 is a red color filter and thesecond color filter 322 is a blue color filter, and the first colorpixel PX1 is a red pixel and the second color pixel PX2 is a blue pixel.

In each of the above-described examples, the columnar spacer SP is notdisposed at all positions where the first light-shield portion 311 andsecond light-shield portion 312 intersect. At a position where thecolumnar spacer SP is not disposed, there is no need to provide thesubstantially octagonal crossing portion CR as shown in FIG. 5 or thegradually widening intermediate light-shield portion 313 as shown inFIG. 7, and the first light-shield portion 311 and second light-shieldportion 312 intersect in a cross shape. As regards this point, anexample will be described below.

FIG. 8 is a plan view which schematically illustrates the structure of acounter-substrate CT, which is applicable to the liquid crystal displaypanel LPN having the pixel structure shown in FIG. 3.

In the example illustrated, a red pixel PXR1, a blue pixel PXB1, a greenpixel PXG1, a red pixel PXR2, a blue pixel PXB2, . . . , aresuccessively arranged from the left side to the right side in the firstdirection X. A black matrix 31 includes first light-shield portions3111, 3112, . . . , which extend in the first direction X, and secondlight-shield portions 3121, 3122, 3123, 3124, 3125, . . . , which extendin the second direction Y. The black matrix 31 is formed in anorthogonal grating shape, and partitions the respective color pixels.

A first crossing portion CR1 having, for example, the above-describedsubstantially octagonal shape is formed between the red pixel PXR1 andblue pixel PXB1 at a position where the first light-shield portion 3112and second light-shield portion 3122 intersect. At a position where thefirst light-shield portion 3111 and second light-shield portion 3122intersect or at other positions where the first light-shield portionsand second light-shield portions intersect, a first crossing portion ofa substantially octagonal shape is not formed, but second crossingportions CR2 of a substantially rectangular shape are formed. The secondcrossing portion CR2 is formed by the first light-shield portion andsecond light-shield portion intersecting at right angles in a crossshape. The area of the first crossing portion CR1 is larger than thearea of the second crossing portion CR2.

Thus, in the example illustrated, the first light-shield portion 311 andsecond light-shield portion 312 of the black matrix 31 form asubstantially rectangular aperture portion in each pixel, that is, anaperture portion having four corners. To be more specific, the firstlight-shield portion 311 and second light-shield portion 312 form asubstantially rectangular aperture portion in the green pixel PXG1, redpixel PXR2, etc., and form a substantially pentagonal aperture portion,that is, an aperture portion having five corners, in the red pixel PXR1and blue pixel PXB1. Specifically, in the red pixel PXR1 and blue pixelPXB1, the aperture portion has one corner shielded by the black matrix31, although the aperture portion is normally substantially rectangular.In short, the four corners of the aperture portion corresponding to thegreen pixel PXG1, red pixel PXR2, etc. are defined by crossing portionshaving the same shape as the second crossing portion CR2, while onecorner of the aperture portion corresponding to the red pixel PXR1 andblue pixel PXB1 is defined by a crossing portion having the same shapeas the first crossing portion CR1. Thus, despite pixels corresponding tothe same color, for example, the area of the aperture portion(pentagonal) of the red pixel PXR1 is smaller than the area of theaperture portion (rectangular) of the red pixel PXR2, and the area ofthe aperture portion (pentagonal) of the blue pixel PXB1 is smaller thanthe area of the aperture portion (rectangular) of the blue pixel PXB2.

When the area (aperture ratio) of the aperture portion of the pixelfacing, on the four sides, the crossing portions having the same shapeas the second crossing portion CR 2, for example, the red pixel PXR2, is100%, the area of the aperture portion of the pixel of the same color,for example, the red pixel PXR1, which faces the crossing portion havingthe same shape as the first crossing portion CR1, is 93% to 97%.Specifically, the black matrix 31 shields 3% to 7% of the normal area ofthe aperture portion of the red pixel PXR1.

In addition, a distance D from the outer periphery of the columnarspacer SP to the oblique side of the first crossing portion CR1 is 10 μmto 20 μm in the liquid crystal display panel LPN having a resolution of300 ppi.

A red color filter 32R1 is disposed in the red pixel PXR1. The red colorfilter 32R1 extends to the blue pixel PXB1 side on the firstlight-shield portion 3112. A blue color filter 32B1 is disposed in theblue pixel PXB1. A green color filter 32G1 is disposed in the greenpixel PXG1. A red color filter 32R2 is disposed in the red pixel PXR2. Ablue color filter 32B2 is disposed in the blue pixel PXB2.

The columnar spacer SP is disposed at the first crossing portion CR1where the first light-shield portion 3112 and second light-shieldportion 3122 intersect, and at the position overlapping the red colorfilter 32R1.

In the counter-substrate CT with the above-described structure, thealignment treatment direction R2 of the second alignment film AL2 is,for example, a direction inclined at several degrees to the seconddirection Y. This alignment treatment direction R2 is a direction fromthe columnar spacer SP toward the blue pixel PXB1.

FIG. 9 is a schematic plan view for explaining a positional relationshipbetween the black matrix 31, color filter 32 and columnar spacer SP inthe counter-substrate CT, which is applicable to the liquid crystaldisplay panel LPN having the pixel structure shown in FIG. 4. Thedescription is given of one aspect, which is similar to the exampleshown in FIG. 5.

The black matrix 31 includes a first light-shield portion 311 extendingin the first direction X, and a second light-shield portion 312extending in a direction crossing the first direction X. The firstlight-shield portion 311 is mainly opposed to the gate line andswitching element shown in FIG. 4, which extend in the first directionX. The first light-shield portion 311 has a first width W1 in the seconddirection Y. The second light-shield portion 312 is bent and is mainlyopposed to the source line shown in FIG. 4. The second light-shieldportion 312 has a second width W2 in the first direction X. The firstlight-shield portion 311 is greater in width than the secondlight-shield portion 312, and the first width W1 is greater than thesecond width W2.

In the example illustrated, the first light-shield portion 311 andsecond light-shield portion 312 form a crossing portion CR of asubstantially octagonal shape. Specifically, the first light-shieldportion 311 and second light-shield portion 312 extend, withsubstantially uniform respective widths, in mutually crossingdirections, but have gradually increasing widths in the vicinity of thecrossing portion CR.

Incidentally, the first light-shield portion 311 and second light-shieldportion 312 are formed integral or continuous in the same plane. Thus,the outer shape of the crossing portion CR is not visually viewed as theoctagonal shape as shown in FIG. 9. The outer shape of the crossingportion CR is defined by terminal end portions (i.e. sides extending inthe second direction Y with the first width W1) L1 and L2 at which thefirst light-shield portion 311 keeps the first width W1, terminal endportions (i.e. sides extending in the first direction X with the secondwidth W2) L3 and L4 at which the second light-shield portion 312 keepsthe second width W2, and oblique sides L5 to L8 which connect theseterminal end portions. The oblique sides L5 to L8 have straight shapesextending in directions different from the first direction X and seconddirection Y. In the meantime, the respective terminal end portions maybe connected with curved lines. The curved lines in this case arerecessed toward the inside of the crossing portion CR.

The color filter 32 includes a first color filter 321 which is disposedon the left side in FIG. 9 and a second color filter 322 which isdisposed on the right side in FIG. 9. The first color filter 321 extendsover the first light-shield portion 311, and is disposed in the firstcolor pixels PX1 which neighbor in the second direction Y, with thefirst light-shield portion 311 interposed. The second color filter 322is a color filter of a color different from the color of the first colorfilter 321, extends over the first light-shield portion 311, and isdisposed in the second color pixels PX2 which neighbor in the seconddirection Y, with the first light-shield portion 311 interposed.

In this case, if a pixel boundary B between the first color pixel PX1and second color pixel PX2 is provided on the second light-shieldportion 312 in accordance with the shape of the source line S shown inFIG. 4, an edge 321E of the first color filter 321 extends along thepixel boundary B on the second light-shield portion 312, and extends onthe second color pixel PX2 side of the pixel boundary B (i.e. toward theside L1 of the crossing portion CR) in the crossing portion CR. Thus,the most part of the color filter, which overlaps the crossing portionCR, is the first color filter 321.

The columnar spacer SP is disposed at a position overlapping thecrossing portion CR. The underlayer of the columnar spacer SP is asingle color filter, and is the first color filter 321 in the exampleillustrated. In this example, the center O of the columnar spacer SP isoffset from the pixel boundary B toward the second color pixel PX2. Inthis case, like the above-described example, the offset amount from thepixel boundary B to the center O of the columnar spacer SP is allowablewithin such a range that a part of the columnar spacer SP is located onthe pixel boundary B. For example, the offset amount is allowable withina range of 1 μm to 5 μm. In the meantime, the center O of the columnarspacer SP may be located on the pixel boundary B. In addition, in theexample illustrated, the columnar spacer SP has a circular outer shapein the X-Y plane, but it may have a polygonal shape or an ellipticshape.

The above-described first color filter 321 and second color filter 322are ones selected from a red color filter, a green color filter and ablue color filter, and the first color pixel PX1 and second color pixelPX2 are ones selected from a red pixel, a green pixel and a blue pixel.For example, the first color filer 321 is a red color filter and thesecond color filter 322 is a blue color filter, and the first colorpixel PX1 is a red pixel and the second color pixel PX2 is a blue pixel.

The cross section including the columnar spacer SP of thecounter-substrate CT shown in FIG. 9 is substantially the same as in theexample shown in FIG. 6, so a description thereof is omitted here.

Although another aspect as in the example shown in FIG. 7 may bedescribed, the description is omitted here.

FIG. 10 is a plan view which schematically illustrates the structure ofa counter-substrate CT, which is applicable to the liquid crystaldisplay panel LPN having the pixel structure shown in FIG. 4.

In the example illustrated, a red pixel PXR1, a blue pixel PXB1, a greenpixel PXG1, a red pixel PXR2, a blue pixel PXB2, . . . , aresuccessively arranged from the left side to the right side in the firstdirection X. A black matrix 31 includes first light-shield portions3111, 3112, . . . , which extend in the first direction X, and secondlight-shield portions 3121, 3122, 3123, 3124, . . . , which extend inthe second direction Y. The black matrix 31 is formed in anon-orthogonal grating shape, and partitions the respective colorpixels.

A crossing portion CR having, for example, the above-describedsubstantially octagonal shape is formed between the red pixel PXR1 andblue pixel PXB1 at a position where the first light-shield portion 3112and second light-shield portion 3121 intersect. At a position where thefirst light-shield portion 3111 and second light-shield portion 3122intersect or at other positions where the first light-shield portionsand second light-shield portions intersect, a crossing portion of asubstantially octagonal shape is not formed, but crossing portions of asubstantially cross shape are formed.

Thus, in the example illustrated, the first light-shield portion 311 andsecond light-shield portion 312 of the black matrix 31 form apertureportions with V-shaped bent shapes in the respective pixels. In the redpixel PXR1 and blue pixel PXB1, the aperture portion has one cornershielded by the black matrix 31, although the aperture portion normallyhas a V-shaped bent shape. Thus, despite pixels having the same color,for example, the area of the aperture portion of the red pixel PXR1 issmaller than the area of the aperture portion of the red pixel PXR2, andthe area of the aperture portion of the blue pixel PXB1 is smaller thanthe area of the aperture portion of the blue pixel PXB2.

A red color filter 32R1 is disposed in the red pixel PXR1. The red colorfilter 32R1 extends to the blue pixel PXB1 side on the firstlight-shield portion 3112. A blue color filter 32B1 is disposed in theblue pixel PXB1. A green color filter 32G1 is disposed in the greenpixel PXG1. A red color filter 32R2 is disposed in the red pixel PXR2. Ablue color filter 32B2 is disposed in the blue pixel PXB2.

The columnar spacer SP is disposed at a position where the firstlight-shield portion 3112 and second light-shield portion 3121intersect, where the columnar spacer SP overlaps the red color filter32R1.

In the counter-substrate CT with the above-described structure, thealignment treatment direction R2 of the second alignment film AL2 is,for example, a direction parallel to the second direction Y. Thisalignment treatment direction R2 is a direction from the columnar spacerSP toward the blue pixel PXB1.

In the above-described embodiment, the columnar spacer SP is formed in amanner to overlap the black matrix 31, so as not to affect the displayin the aperture portion. When the second alignment film AL2, whichcovers the columnar spacer SP, is subjected to alignment treatment suchas rubbing treatment, there is a case in which the columnar spacer SPbecomes an obstacle, and there occurs an area where proper alignmenttreatment fails to be performed (“defective alignment treatment area”).Such a defective alignment treatment area extends from the position ofthe columnar spacer SP, as a starting point, to the downstream side ofthe alignment treatment direction R2. In particular, in theabove-described FFS mode, if a normally black mode, in which black isdisplayed in the state in which no voltage is applied to the liquidcrystal layer LQ, is to be realized, there is concern that the alignmentdirections of liquid crystal molecules do not become uniform in thedefective alignment treatment area and light leakage occurs. Inaddition, when such a stress acts on the liquid crystal panel LPN as topress or distort the liquid crystal panel LPN, the columnar spacer SPmay possibly be displaced due to a received load. At this time, there isconcern that the alignment of liquid crystal molecules in the vicinityof the columnar spacer SP is disturbed and light leakage occurs. In anycase, light leakage in the vicinity of the columnar spacer SP may leadto degradation in contrast ratio.

According to the present embodiment, the columnar spacer SP is disposedat a position where the first light-shield portion 311 and secondlight-shield portion 312 of the black matrix 31 intersect. In addition,the area of the black matrix 31, which is located immediately below thecolumnar spacer SP (i.e. the area of the substantially octagonalcrossing portion CR, or the area including the intermediate light-shieldportion 313), is larger than the area where the columnar spacer SP isnot disposed (i.e. the area of the substantially cross-shaped blackmatrix 31 at which the first light-shield portion 311 and secondlight-shield portion 312 intersect).

Thus, even if a defective alignment treatment area forms with a startingpoint at the columnar spacer SP, the defective alignment treatment areaoverlaps the black matrix 31 and therefore light leakage can besuppressed. In addition, even if a displacement of the columnar spacerSP occurs, light leakage can be suppressed since the peripheral area ofthe columnar spacer SP is shield by the black matrix over a wide area.Therefore, degradation in contrast ratio can be suppressed, anddegradation in display quality can be suppressed.

In addition, in the present embodiment, the color filter 32, which ispresent between the columnar spacer SP and the black matrix 31, is asingle layer. Thus, the columnar spacer SP is not affected by a steppedportion which may occur due to abutment between the edges of neighboringcolor filters, and the columnar spacer SP can be formed with a stableshape on a planar surface. Therefore, a variance in height of columnarspacers SP can be reduced. Thereby, a uniform cell gap can be createdbetween the array substrate AR and the counter-substrate CT. Moreover,all columnar spacers SP can receive a substantially uniform load, and itis possible to suppress the occurrence of bubbles due to quickcontraction of the liquid crystal material when a shock is applied in alow-temperature state.

Besides, in the present embodiment, the columnar spacer SP is disposedbetween the red pixel PXR1 and blue pixel PXB1. Of the three primarycolors of red, green and blue, the color with a lowest luminousefficiency is blue and the color with a highest luminous efficiency isgreen. Specifically, the columnar spacer SP is disposed between thepixels which display two less conspicuous colors. In addition, thealignment treatment direction R2 of the second alignment film AL2 is adirection from the columnar spacer SP toward the blue pixel PXB1. Thus,even if the defective alignment treatment area, which forms from thecolumnar spacer SP as a starting point, extends to the aperture portionof the blue pixel PXB1, the effect on the display can be reduced.

In addition, in the present embodiment, in the black matrix 31, thecrossing portion, which is located immediately below the columnar spacerSP, shields 3% to 7% of the area of the normal aperture portion of thepixel. The lower limit of 3% is based on the area of the crossingportion that is necessary for suppressing the above-described lightleakage. The upper limit of 7% is an upper limit value at which adecrease in transmittance is not visually recognized when the area ofthe aperture portion of the pixel has decreased. In connection with thispoint, evaluations below were conducted, and the validity of this valuewas confirmed.

FIG. 11 is a view illustrating an evaluation method and an evaluationresult of transmittance using a pseudo-pattern.

Specifically, an upper left part of FIG. 11 shows a plan view of anactual device, which has been described with reference to FIG. 3 andFIG. 8, and color pixels are successively arranged in the order of a redcolor R, a green color g, a blue color B, a red color R, . . . . Inaddition, the black matrix 31 in the vicinity of the columnar spacer SPis expanded. As regards the four pixels around the columnar spacer SP,the areas of their aperture portions are smaller than the areas of theother aperture portions.

An upper right part of FIG. 11 shows a pseudo-pattern which is capableof effecting display that is equivalent to the display of the actualdevice. The positions of the columnar spacers SP are the same as thosein the actual device. As regards the four pixels around the columnarspacer SP, their transmittances are set to be lower than thetransmittances of the other pixels. In this manner, by reducing thetransmittances of the pixels, the decrease in area of the pixel apertureportions is reproduced.

As regards this pseudo-pattern, evaluations were conducted of thedisplay state in which the transmittance of the four pixels (associatedpixels) of the columnar spacer SP was set at −7% and the display statein which the transmittance of the four pixels of the columnar spacer SPwas set at −10%, with respect to the case in which red R is displayed ata maximum gray level of 256 gray levels (R255), the case in which red Rand blue B are displayed at the maximum gray level (RB255), the case inwhich red R, green G and blue B are displayed at the maximum gray level(W255), the case in which red R is displayed at an intermediate graylevel (R127), and the case in which red R and blue B are displayed atthe intermediate gray level (RB127).

The evaluation was conducted based on the following criteria: there isno visible influence due to a decrease in transmittance (5 points);there is little visible influence due to a decrease in transmittance (4points); there is unnaturalness due to a decrease in transmittance (3points); there is visible influence due to a decrease in transmittance(2 points); and there is conspicuous influence due to a decrease intransmittance, and NG (1 point).

A lower part of FIG. 11 shows evaluation results of the display statesby seven test subjects A to G.

As regards (R255), (RB255), (R127) and (RB127), the influence due to thedecrease in transmittance was visually recognized in some cases in thedisplay state with the transmittance of −10%. However, in the displaystate with the transmittance of −7%, it was confirmed that littleinfluence due to the decrease in transmittance was visually recognized.In these evaluations, too, it was confirmed that the black matrix 31 canshield 7% or less of the area of the normal aperture portion.

As has been described above, according to the present embodiment, therecan be provided a liquid crystal display device which can suppressdegradation in display quality.

While certain embodiments have been described, these embodiments havebeen presented by way of example only, and are not intended to limit thescope of the inventions. Indeed, the novel embodiments described hereinmay be embodied in a variety of other forms; furthermore, variousomissions, substitutions and changes in the form of the embodimentsdescribed herein may be made without departing from the spirit of theinventions. The accompanying claims and their equivalents are intendedto cover such forms or modifications as would fall within the scope andspirit of the inventions.

What is claimed is:
 1. A liquid crystal display device comprising: ablack matrix comprising aperture portions; a first color filter; asecond color filter adjacent to the first color filter in a firstdirection; a first source line, a second source line adjacent to thefirst source line in the first direction; and a gate line extending inthe first direction, wherein the aperture portions comprise a firstaperture portion, a second aperture portion adjacent to the firstaperture portion in the first direction, a third aperture portionadjacent to the first aperture portion in a second directionintersecting the first direction, and a fourth aperture portion adjacentto the second aperture portion in the second direction and adjacent tothe third aperture portion in the first direction, each of the first tofourth aperture portions has a first area and a second area, the firstarea is an aperture area having an inclination in a third direction, thesecond area is an aperture area having an inclination in a fourthdirection, the third direction crosses the second direction at an acuteangle in a clockwise direction, the fourth direction crosses the seconddirection at an acute angle in a counterclockwise direction, the firstcolor filter overlaps the first aperture portion and the third apertureportion, the second color filter overlaps the second aperture portionand the fourth aperture portion between the first source line and thesecond source line, the first source line is located between the firstaperture portion and the second aperture portion, and between the thirdaperture portion and the fourth aperture portion, the first color filterhas a convex portion protruding toward the second source line in a planview, the second color filter has a concave portion recessed toward thesecond source line in a plan view, and the convex portion and theconcave portion are opposed to each other between second apertureportion and the fourth aperture portion in the second direction.
 2. Theliquid crystal display device according to claim 1, wherein the blackmatrix comprises a first light-shielding portion, the firstlight-shielding portion extends in the first direction and overlaps thegate line, the first light-shielding portion and the gate line arelocated between the first aperture portion and third aperture portion,and between the second aperture portion and the fourth aperture portion,and the convex portion and the concave portion overlap the firstlight-shielding portion.
 3. The liquid crystal display device accordingto the claim 2, wherein the convex portion of the first color filterextends beyond the first source line, and a tip of the convex portion isbetween the first source line and the second source line.
 4. The liquidcrystal display device according to claim 3, wherein the firstlight-shielding layer is sandwiched by the second area of the secondaperture portion and the first area of the fourth aperture portion inthe second direction.
 5. The liquid crystal display device according toclaim 4, wherein the first area and the second area are connectedintegrally, each of the first to fourth aperture portions is bent in aV-shape, a bent position of the V-shape of the first to fourth apertureportions protrudes toward a first side of the first direction in a planview, the convex portion protrudes toward the first side of the firstdirection in a plan view, and the concave portion recesses toward thefirst side of the first direction in a plan view.
 6. The liquid crystaldisplay device according to claim 5, further comprising a spacer havinga top and a bottom; and an overcoat layer covering the first colorfilter and the second color filter, wherein the bottom of the spacer isin contact with the overcoat layer and overlaps the first color filter,and the bottom of the spacer is located inside the concave portion. 7.The liquid crystal display device according to the claim 1, wherein theconvex portion of the first color filter extends beyond the first sourceline, and a tip of the convex portion is between the first source lineand the second source line.
 8. The liquid crystal display deviceaccording to claim 7, further comprising a spacer having a top and abottom; and an overcoat layer covering the first color filter and thesecond color filter; wherein the bottom of the spacer is in contact withthe overcoat layer and overlaps the first color filter, and the bottomof the spacer is located inside of the concave portion.